MQL4参考标准常量，列举和架构交易常数 历史数据库属性

History Database Properties

When accessing timeseries the SeriesInfoInteger() function is used for obtaining additional symbol information. Identifier of a required property is passed as the function parameter. The identifier can be one of values of ENUM_SERIES_INFO_INTEGER.

ENUM_SERIES_INFO_INTEGER

Identifier	Description	Type
SERIES_BARS_COUNT	Bars count for the symbol-period for the current moment	long
SERIES_FIRSTDATE	The very first date for the symbol-period for the current moment	datetime
SERIES_LASTBAR_DATE	Open time of the last bar of the symbol-period	datetime
SERIES_SERVER_FIRSTDATE	The very first date in the history of the symbol on the server regardless of the timeframe	datetime

交易常数订单属性